Tuesday, July 23, 2013

1307.5527 (David Sloan)

Loop Quantum Cosmology and the Fine Structure Constant    [PDF]

David Sloan
The cosmological implications of introducing a variation to the fine structure `constant', \alpha are examined within the context of Loop Quantum Cosmology. The evolution of \alpha is described using the model introduced by Bekenstein, Sandvik, Barrow and Magueijo, in which a ghost scalar field produces the variation. The dynamics of the system are examined in flat and closed cosmological settings. Matter consisting of the scalar field and radiation are examined with a thermodynamically motivated coupling between the two, which can lead to a series of bounces induced by both the negative density effects of the ghost field and the loop effects.
View original: http://arxiv.org/abs/1307.5527

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